/*
 * Copyright (C) 2007 Henry Mason (hmason@mac.com)
 * Copyright (C) 2003-2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 *
 */

#pragma once

#include "Event.h"
#include "JSValueInWrappedObject.h"
#include "MessagePort.h"
#include "SerializedScriptValue.h"
#include "ServiceWorker.h"
#include "WindowProxy.h"
#include <variant>

namespace WebCore {

class Blob;

using MessageEventSource = std::variant<RefPtr<WindowProxy>, RefPtr<MessagePort>, RefPtr<ServiceWorker>>;

class MessageEvent final : public Event {
    WTF_MAKE_TZONE_OR_ISO_ALLOCATED(MessageEvent);
public:
    struct JSValueTag { };
    using DataType = std::variant<JSValueTag, Ref<SerializedScriptValue>, String, Ref<Blob>, Ref<ArrayBuffer>>;
    static Ref<MessageEvent> create(const AtomString& type, DataType&&, const String& origin = { }, const String& lastEventId = { }, std::optional<MessageEventSource>&& = std::nullopt, Vector<Ref<MessagePort>>&& = { });
    static Ref<MessageEvent> create(DataType&&, const String& origin = { }, const String& lastEventId = { }, std::optional<MessageEventSource>&& = std::nullopt, Vector<Ref<MessagePort>>&& = { });
    static Ref<MessageEvent> createForBindings();

    struct MessageEventWithStrongData {
        Ref<MessageEvent> event;
        JSC::Strong<JSC::JSObject> strongWrapper; // Keep the wrapper alive until the event is fired, since it is what keeps `data` alive.
    };

    static MessageEventWithStrongData create(JSC::JSGlobalObject&, Ref<SerializedScriptValue>&&, const String& origin = { }, const String& lastEventId = { }, std::optional<MessageEventSource>&& = std::nullopt, Vector<Ref<MessagePort>>&& = { });

    struct Init : EventInit {
        JSC::JSValue data;
        String origin;
        String lastEventId;
        std::optional<MessageEventSource> source;
        Vector<Ref<MessagePort>> ports;
    };
    static Ref<MessageEvent> create(const AtomString& type, Init&&, IsTrusted = IsTrusted::No);

    virtual ~MessageEvent();

    void initMessageEvent(const AtomString& type, bool canBubble, bool cancelable, JSC::JSValue data, const String& origin, const String& lastEventId, std::optional<MessageEventSource>&&, Vector<Ref<MessagePort>>&&);

    const String& origin() const { return m_origin; }
    const String& lastEventId() const { return m_lastEventId; }
    const std::optional<MessageEventSource>& source() const { return m_source; }
    const Vector<Ref<MessagePort>>& ports() const { return m_ports; }

    const DataType& data() const { return m_data; }

    JSValueInWrappedObject& jsData() { return m_jsData; }
    JSValueInWrappedObject& cachedData() { return m_cachedData; }
    JSValueInWrappedObject& cachedPorts() { return m_cachedPorts; }

    size_t memoryCost() const;

private:
    MessageEvent();
    MessageEvent(const AtomString& type, Init&&, IsTrusted);
    MessageEvent(const AtomString& type, DataType&&, const String& origin, const String& lastEventId = { }, std::optional<MessageEventSource>&& = std::nullopt, Vector<Ref<MessagePort>>&& = { });

    DataType m_data WTF_GUARDED_BY_LOCK(m_concurrentDataAccessLock);
    String m_origin;
    String m_lastEventId;
    std::optional<MessageEventSource> m_source;
    Vector<Ref<MessagePort>> m_ports;

    JSValueInWrappedObject m_jsData;
    JSValueInWrappedObject m_cachedData;
    JSValueInWrappedObject m_cachedPorts;

    mutable Lock m_concurrentDataAccessLock;
};

} // namespace WebCore
